The FAST EZ efi is worth the money. Love mine, the time slips show .01 better on 60ft and .3mph less on top end to a well tuned quick fuel with annular boosters..That's pretty close.

And with some of the digital timing systems available, that just a pay check away if you want it.

The other option is to find a Classic FAST system used and go with that. I have one I might sell just to upgrade to XFI on my one car. I see them for sale here and there.

'70 Cuda,...605 EFI Hemi Street Car (6.20 best pass, 1.33 60ft)
https://www.youtube.com/watch?v=WYw6RA-k5Bk (6.25 at 108.75mph from inside car)
https://www.youtube.com/watch?v=3zQEb9uxFng (6.25 at 108mph from outside car)
https://www.youtube.com/watch?v=JCvfzsC4NgM (9.9)

'66 Barracuda AWB Stretched nose Blown 440 Car in build stage

'71 Duster Drag Car 400 Low Deck 512 best 6.002 at 115.44mph
https://www.youtube.com/watch?v=Znuo3jMUXTk